The standard 620 version makes 575 hp and 600 lb.-ft. of torque from its supercharged 6.2L. SMS claims it will reach 60 mph in 4.3 seconds. The upgraded 620X, with upgraded internals and modified heads, makes a claimed 715 hp and 700 lb.-ft. of torque. It’ll hit 60 mph in 4.0 seconds, SMS says. Both six-speed automatic and manual transmissions are available.

Other features include SMS’s “Red Butterfly Dual Side Induction” hood, gauges, and Alcantara and leather seats with chevron stripes.

SMS plans to launch the 620 and 620X Camaros in second quarter 2010. The Tuner will also be at the Detroit auto show next week with the SMS 570 and 570X Challengers on display. Stay tuned to Motor Trend Online for all our on-the-scene Detroit show coverage, as well as a chat with Steve Saleen.